128 EXPERIMENT STATION EECOED. 



by enlarged doses for short duration, and is characterized by a retardation of 

 the normal processes of plant activity. The third or toxic phase is where large 

 doses or comparatively large doses are used for exposures of long duration, 

 which produce all the phenomena characteristic of the death of the plants. 



An extended bibliography is appended to the paper. 



Delayed germination, L. H. Pammel and Charlotte M. King (Contrib. Bot. 

 Dept. loica State Col., 1911, No. J/S, PiP. 20-33, pi. 1). — ^A resume of earlier in- 

 vestigations of this subject is followed by a full account of the experiments 

 upon which conclusions already noted (E. S. R., 24, p. 330) are based. 



Dimorphic leaves of cotton and allied plants in relation to heredity, O. F. 

 Cook {U. 8. Dept. Agr., Bur. Plant Indus. Bui. 221, pp. 59, pis. 5, flgs. IS). — In 

 continuation of a previous report (E. S. R., 24, p. 444), additional information 

 is given regarding the dimorphic characters and variations of cotton and other 

 plants, the author pointing out some of their relations to the problems of 

 heredity and breeding. It is stated that recognition of dimorphism of the 

 leaves and branches of cotton and other plants enlarges the range of characters 

 that may be used in distinguishing varieties and in determining the influence 

 of environment upon the expression of these characters. In general, there is 

 a parallelism of variation in leaf characters extending through the many 

 species and varieties of cotton, as well as the related genera of plants, and the 

 modification of these dimorphic differences is said to represent one of the most 

 serious disturbances of normal heredity induced by external conditions. 



Honey plants of California, M. C. Richtee (California Sta. Bui. 217, pp. 

 973-1037, figs. l-'i). — This bulletin presents an account of the flora of California 

 which is visited by the honey bee for the purpose of gathering nectar, other 

 sweetish material, pollen, and propolis. An account is given of each species of 

 plants in which is presented a condensed statement giving the available infor- 

 mation regarding the value of the plant to bee keepers. This information is 

 based not only on the literature of the subject but also on the author's observa- 

 tions covering a considerable period. 



The present bulletin is considered as a preliminai-y account, and it is the 

 author's intention to continue the investigation. 



Seeds and plants imported during' the period from July 1 to September 30, 

 1910. Inventory No. 24 {U. 8. Dept. Agr., Bur. Plant Indus. Bui. 223, pp. 

 70). — This bulletin gives a list of miscellaneous seeds and plants imported by 

 the Oflice of Foreign Seed and Plant Introduction during the period mentioned 

 above, the number of introductions being about 550. 



Seeds and plants imported during the period from October 1 to December 

 31, 1910. Inventory No. 25 (U. S. Dept. Agr., Bur. Plant Indus. Bui. 227, pp. 

 GO). — A list is given of the seeds and plants imported during the period men- 

 tioned above, most of the material having been collected by Mr. F. N. Meyer, 

 agricultural explorer in Russian and Chinese Turkestan. About 450 numbers 

 are given. 



FIELD CROPS. 



The importance of water in the life of cultivated plants, C. von Seelhorst 

 (Jour. Landic, 59 {1911), No. 3, pp. 259-291). — This article summarizes the 

 results of experiments on the importance of water in the growth of plants, 

 conducted at Gottingen during the past 14 years by the author and others asso- 

 ciated with him. The results of the various experiments have been previously 

 published in 33 different articles, and the more impoi-tant features of the work 

 are here reviewed. 



In general it was found that a high soil moisture content reduced the per- 

 centage of nitrogen and of protein and increased the percentage of ash in the 



